Many carriers these days are blocking apps from the Market, like Google Wallet or Wireless Tether. Droid Life shows us a super easy way to install them on your unrooted phone.

Note that this only works for blocked apps, not incompatible apps. If Google Wallet, for example, is listed as incompatible with your hardware, this trick won't work. It'll only work for devices that it's compatible with but blocked in the Market (like the Galaxy Nexus on Verizon).

Earlier today I tried installing the popular tethering application PDAnet on my AT&T Android…
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Search for the app in your phone's browser.

Click on the Android Market search result from Google (it should have a market.android.com URL).

When prompted, do not choose to open the link with "Market". Pick "Browser" instead.

Tap the "install" button from within the browser, and sign in to the Market if necessary (again, staying in the browser).

At this point, it should redirect you back to the Market page in the browser. You won't be able to hit Install, but if you tap the back button, you'll be prompted to open the Market again—this time, tap Market.

The Market page should open up as normal, and you can install it from there.

It looks like the carriers are really only blocking these apps from Market search results, not the Market itself. Of course, you can often find APKs for apps like this around the net (such as on Wireless Tether's Google Code page), but with other apps that may not be possible—and besides, this is way easier.